Quasireversible Process of Dopamine on Copper-Nickel Hydroxide Composite/Nitrogen Doped Graphene/Nafion Modified GCE and Its Electrochemical Application

Liu, Chuanyin; Liu, Zhong-yong; Peng, Rong; Zhong, Zhicheng

doi:10.1155/2014/724538

Cited by 9 publications

(9 citation statements)

References 27 publications

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“…These particular findings are in a good agreement with previous published data of DOPA in solid electrodes [ 30 , 31 , 32 ]. As concluded, DOPA was oxidized electrochemically on the surface of a bare SPE into the corresponding dopaminoquinone, via the transfer of two electrons and two protons.…”

Section: Validation Of Spessupporting

confidence: 93%

A Disposable Microfluidic Device with a Screen Printed Electrode for Mimicking Phase II Metabolism

Vasiliadou

Esfahani

Brown

et al. 2016

Sensors

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Human metabolism is investigated using several in vitro methods. However, the current methodologies are often expensive, tedious and complicated. Over the last decade, the combination of electrochemistry (EC) with mass spectrometry (MS) has a simpler and a cheaper alternative to mimic the human metabolism. This paper describes the development of a disposable microfluidic device with a screen-printed electrode (SPE) for monitoring phase II GSH reactions. The proposed chip has the potential to be used as a primary screening tool, thus complementing the current in vitro methods.

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Section: Validation Of Spessupporting

confidence: 93%

A Disposable Microfluidic Device with a Screen Printed Electrode for Mimicking Phase II Metabolism

Vasiliadou

Esfahani

Brown

et al. 2016

Sensors

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“…This relationship of direct proportionality is indicative of a diffusion-controlled electron-transfer process [ 82 ], excluding a surface-controlled process for this redox system [ 83 ]. Besides, the i a /i c ratio is far from the value of 1, meaning that a quasi-reversible process is occurring [ 84 ].…”

Section: Resultsmentioning

confidence: 99%

One A3B Porphyrin Structure—Three Successful Applications

et al. 2022

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Porphyrins are versatile structures capable of acting in multiple ways. A mixed substituted A3B porphyrin, 5-(3-hydroxy-phenyl)-10,15,20-tris-(3-methoxy-phenyl)-porphyrin and its Pt(II) complex, were synthesised and fully characterised by 1H- and 13C-NMR, TLC, UV-Vis, FT-IR, fluorescence, AFM, TEM and SEM with EDX microscopy, both in organic solvents and in acidic mediums. The pure compounds were used, firstly, as sensitive materials for sensitive and selective optical and fluorescence detection of hydroquinone with the best results in the range 0.039–6.71 µM and a detection limit of 0.013 µM and, secondly, as corrosion inhibitors for carbon–steel (OL) in an acid medium giving a best performance of 88% in the case of coverings with Pt-porphyrin. Finally, the electrocatalytic activity for the hydrogen and oxygen evolution reactions (HER and OER) of the free-base and Pt-metalated A3B porphyrins was evaluated in strong alkaline and acidic electrolyte solutions. The best results were obtained for the electrode modified with the metalated porphyrin, drop-casted on a graphite substrate from an N,N-dimethylformamide solution. In the strong acidic medium, the electrode displayed an HER overpotential of 108 mV, at i = −10 mA/cm2 and a Tafel slope value of 205 mV/dec.

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“…Jacobs et al [27] reviewed the use of MWCNTs to obtain enhanced signals in the detection of substances such as carbohydrates, nucleic acids, glucose, pesticides, and serotonin, with similar reports relating to trace metals [28] and nitroaromatic compounds [29]. There are several literatures on the electro-oxidation of dopamine on modified electrodes [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Metal Oxide Nanoparticles/Multi-walled Carbon Nanotube Nanocomposite Modified Electrode for the Detection of Dopamine: Comparative Electrochemical Study

Fayemi¹,

Adekunle²

2015

J Biosens Bioelectron

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Electrochemical properties and sensor application of multi-walled carbon nanotubes (MWCNTs), doped with metal oxides [(MO=nickel oxide (NiO), zinc oxide (ZnO) and iron oxide (Fe 3 O 4 )] nanoparticles was investigated using FTIR, XRD, UV-vis spectroscopy, Raman spectroscopy, TEM, SEM, EDX, and cyclic voltammetry techniques. Electrochemical oxidation of dopamine on a glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes doped with metal oxides (GCE/MWCNT/NiO, GCE/MWCNT/ZnO, GCE/MWCNT/Fe 3 O 4 ) was examined by cyclic voltammetry, EIS and square wave voltammetry in 0.1 M phosphate buffer solution PBS at pH 7. The results were compared with those obtained on bare GCE, GCE/MWCNT and MO GCE modified electrodes (GCE/NiO, GCE/ZnO, GCE/Fe 3 O 4 ). All electrodes were conditioned at potential of 0.2V (vs Ag/AgCl, sat'd KCl) in DA solution for EIS experiment. It was found that the multi-walled carbon nanotubes improve remarkably the reactivity of NiO, ZnO and Fe 3 O 4 for dopamine oxidation. The GCE/MWCNT/NiO, GCE/MWCNT/ZnO, GCE/MWCNT/Fe 3 O 4 electrodes exhibited good linear properties in the concentration range from 4 × 10 -5 µM to 6.25 µM for the quantitative analysis of dopamine (DA) with a limit of detection of 7.99 × 10 -12 M, 3.742 × 10 -7 M and 1.386 × 10 -6 M respectively. The limit of detection of GCE/MWCNT/NiO was better than the other two nanocomposites modified electrodes. The interference study also revealed no AA interference signal at AA concentration 1000 times that of DA. The DPV techniques give well distinct peaks for the DA and AA and a wider separation potential. The prepared electrode exhibited satisfactory stability and long shelf life when stored at ambient conditions. It has been demonstrated that the GCE/MWCNT/NiO modified electrode can be successfully used for the assay of dopamine in some real samples.

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Quasireversible Process of Dopamine on Copper-Nickel Hydroxide Composite/Nitrogen Doped Graphene/Nafion Modified GCE and Its Electrochemical Application

Cited by 9 publications

References 27 publications

A Disposable Microfluidic Device with a Screen Printed Electrode for Mimicking Phase II Metabolism

A Disposable Microfluidic Device with a Screen Printed Electrode for Mimicking Phase II Metabolism

One A3B Porphyrin Structure—Three Successful Applications

Metal Oxide Nanoparticles/Multi-walled Carbon Nanotube Nanocomposite Modified Electrode for the Detection of Dopamine: Comparative Electrochemical Study

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